const CopyWebpackPlugin = require('copy-webpack-plugin')
const name = '后台系统' // page title
const webpack = require("webpack");
const path = require('path')

function resolve(dir) {
  return path.join(__dirname, dir)
}

module.exports = {
  publicPath: '/',
  outputDir: 'dist',
  assetsDir: 'static',
  lintOnSave: process.env.NODE_ENV === 'development',
  productionSourceMap: false,
  devServer: {
    progress: false,
    open: true, //是否自动弹出浏览器页面，默认未开启
    // proxy: {}
  },
  configureWebpack: {
    // provide the app's title in webpack's name field, so that
    // it can be accessed in index.html to inject the correct title.
    name: name,
    resolve: {
      alias: {
        '@': resolve('src')
      }
    },
    module: {
      unknownContextRegExp: /^('|')\.\/.*?\1$/,
      // cesium 3 不加这个配置会报require引入警告
      unknownContextCritical: false
    },
    amd: {
      // cesium 2
      toUrlUndefined: true
    },
    plugins: [
      // copy custom static assets
      new CopyWebpackPlugin([
        {
          from: path.resolve(__dirname, './static'),
          to: 'static/',
          ignore: ['.*']
        }
      ]),
      new CopyWebpackPlugin([
        {from: 'node_modules/cesium/Build/Cesium/Workers', to: 'cesium/Workers'},
        {from: 'node_modules/cesium/Build/Cesium/ThirdParty', to: 'cesium/ThirdParty'},
        {from: 'node_modules/cesium/Build/Cesium/Assets', to: 'cesium/Assets'},
        {from: 'node_modules/cesium/Build/Cesium/Widgets', to: 'cesium/Widgets'}
      ]),
      new webpack.DefinePlugin({
        CESIUM_BASE_URL: JSON.stringify("./cesium")
      })
    ]
  },

  chainWebpack(config) {
    config.plugin('preload').tap(() => [
      {
        rel: 'preload',
        // to ignore runtime.js
        // https://github.com/vuejs/vue-cli/blob/dev/packages/@vue/cli-service/lib/config/app.js#L171
        fileBlacklist: [/\.map$/, /hot-update\.js$/, /runtime\..*\.js$/],
        include: 'initial'
      }
    ])

    // when there are many pages, it will cause too many meaningless requests
    config.plugins.delete('prefetch')

    // set svg-sprite-loader
    config.module
      .rule('svg')
      .exclude.add(resolve('src/icons'))
      .end()
    config.module
      .rule('icons')
      .test(/\.svg$/)
      .include.add(resolve('src/icons'))
      .end()
      .use('svg-sprite-loader')
      .loader('svg-sprite-loader')
      .options({
        symbolId: 'icon-[name]'
      })
      .end()

    config
      .when(process.env.NODE_ENV !== 'development',
        config => {
          config.plugin('ScriptExtHtmlWebpackPlugin')
            .after('html')
            .use('script-ext-html-webpack-plugin', [{
              // `runtime` must same as runtimeChunk name. default is `runtime`
              inline: /runtime\..*\.js$/
            }])
            .end()

          config.optimization.minimizer('terser').tap((args) => {
            // 注释console.*
            args[0].terserOptions.compress.drop_console = true
            // remove debugger
            args[0].terserOptions.compress.drop_debugger = true
            // 移除 console.log
            args[0].terserOptions.compress.pure_funcs = ['console.log']
            return args
          })

          config.optimization.splitChunks({
            chunks: 'all',
            cacheGroups: {
              libs: {
                name: 'chunk-libs',
                test: /[\\/]node_modules[\\/]/,
                priority: 10,
                chunks: 'initial' // only package third parties that are initially dependent
              },
              elementUI: {
                name: 'chunk-elementUI', // split elementUI into a single package
                priority: 20, // the weight needs to be larger than libs and app or it will be packaged into libs or app
                test: /[\\/]node_modules[\\/]_?element-ui(.*)/ // in order to adapt to cnpm
              },
              commons: {
                name: 'chunk-commons',
                test: resolve('src/components'), // can customize your rules
                minChunks: 3, //  minimum common number
                priority: 5,
                reuseExistingChunk: true
              }
            }
          })
          // https:// webpack.js.org/configuration/optimization/#optimizationruntimechunk
          config.optimization.runtimeChunk('single')
        }
      )
  },
}